自 Java 5 以来最好的单例模式

发布于 2024-11-02 19:15:40 字数 587 浏览 0 评论 0原文

从 Java 5 开始，据说创建单例的最佳方法是使用单元素枚举类型。

示例：

public enum SuperSingleton implements Zooma{
    INSTANCE;

    /**
     */
    public void fightTheBattle(){
        System.out.println("I am fighting the battle!!!");
    }

    @Override
    public void runningWild() {
        //This is method implemented from the Zooma interface.      
    }
}

根据 Joshua Bloch 的说法，单元素枚举类型单例是；

更简洁
免费提供序列化机制
，并提供针对多重实例化的铁证。

我可以看到它如何更加简洁以及它如何提供针对多重实例化的铁定， 但是它如何免费提供序列化机制？

它是单例通过成为枚举而获得的东西吗？

原文

Since Java 5 it is said that the best way to create a singleton is by a single-element enum type.

Example:

public enum SuperSingleton implements Zooma{
    INSTANCE;

    /**
     */
    public void fightTheBattle(){
        System.out.println("I am fighting the battle!!!");
    }

    @Override
    public void runningWild() {
        //This is method implemented from the Zooma interface.      
    }
}

According to Joshua Bloch, the single-element enum type singleton is;

more concise
provides the serialization machinery for free
and provides an ironclad against multiple instantiation.

I can see how it is more concise and how it provides an ironclad against multiple instantiation,
but how does it provide the serialization machinery for free?

Is it something the singleton gets by being an enum?

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